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Proof of Concept to automatically fetch missing source bundles from enabled p2 repositories, when opening a bundle jar (similar to m2e). It's also possible to fetch all sources from the Plug-in Dependencies classpath container, with a right-click and selecting Download Bundle Sources. Sources are cached to ~/.eclipse/org.jboss.tools.pde.sourcelookup.core/sources by default. That folder can be changed in Preferences > Plug-in Development > Source Lookup. Because the Plug-in Dependencies classpath container doesn’t keep new attached sources on workspace restart, the PDE Source Lookup plugin automatically reattaches those sources upon restart. This behavior can be disabled in Preferences > Plug-in Development > Source Lookup. Requires an Eclipse Mars.2 or Neon installation (might work on older versions) Requires Java 8 to run.